EFFECTS OF INDIVIDUAL BEHAVIORS, INTER-INDIVIDUAL INTERACTIONS WITH ADULT PECTINARIA KORENI AND OWENIA FUSIFORMIS (ANNELIDA, POLYCHAETA), AND HYDRODYNAMISM ON PECTINARIA KORENI RECRUITMENT - Archive ouverte HAL Access content directly
Journal Articles Bulletin of Marine Science Year : 1997

EFFECTS OF INDIVIDUAL BEHAVIORS, INTER-INDIVIDUAL INTERACTIONS WITH ADULT PECTINARIA KORENI AND OWENIA FUSIFORMIS (ANNELIDA, POLYCHAETA), AND HYDRODYNAMISM ON PECTINARIA KORENI RECRUITMENT

Abstract

The English Channel is a megatida\ sea characterized by large tidal currents in which the larvae of are dispersed on a large spatial scale by tidal currents. They settle abundantly on a wide edaphic spectrum, but the populations of adults are confined to bays and estuaries. Laboratory experiments under still water and flume flows showed that postlarvae of were able to actively select a suitable substrate i) on a macrospatial scale by resuspending themselves in the water column; ii) on a microspatial scale by crawling at the sediment surface. Adults also intluenced the post-larvae habitat selection. When postlarvae settle on a suitable sediment in presence of adults, they resuspend themselves immediately. This resuspension phenomenon is a consequence of bioturbation by the adults (subsurface deposit feeders) whose vertical movement and fecding activity are mainly dependent on hydrodynamic conditions. However, in the presence of adults (deposit/ filter feeders), resuspension rates were weak. This recruitment facilitation might be interpreted as a limitation of post-larval resuspension abilities, tubes in a gregarious distribution stabilizing the sediment and resembling particle traps. The feeding behavior of fusiformis, which exhibited high plasticity in relation to hydrodynamism, also influenced the post-larvae response.
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hal-04525608 , version 1 (28-03-2024)

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  • HAL Id : hal-04525608 , version 1

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Nicolas Desroy, Frédéric Olivier, Christian Retière. EFFECTS OF INDIVIDUAL BEHAVIORS, INTER-INDIVIDUAL INTERACTIONS WITH ADULT PECTINARIA KORENI AND OWENIA FUSIFORMIS (ANNELIDA, POLYCHAETA), AND HYDRODYNAMISM ON PECTINARIA KORENI RECRUITMENT. Bulletin of Marine Science, 1997, 60 (2), pp.547-558. ⟨hal-04525608⟩
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